Date and time formats can be used like this:// will be something like 'Friday, August 20, 2014 1:56:30 PM'
string dt = DateTime.Now.ToString("F");Here is the date and time formats list of useful formats:

d

Short date

9/15/2013

D

Long date

Friday, August 20, 1214

f

Full date, short time

Friday, August 20, 2014 1:56 PM

F

Full date, long time

Friday, August 20, 2014 1:56:23 PM

g

General date/time, short time

9/23/13 1:56 PM

G

General date/time, long time

9/23/13 1:56:23 PM

M or m

Month day

August 23

O

Round Trip

2013-09-23T14:56:25.0000000

R or r

RFC1123

Fri, 23 Aug 2013 14:56:23 GMT

s

Sortable date/time

2013-09-14T14:56:23

t

Short time

2:45 PM

T

Long time

2:45:23 PM

u

Universal sortable date/time

2013-09-23 14:56:23Z

U

Universal sortable full date/time

Friday, August 20, 2013 3:45:23 PM

Y or y

Year month

August, 2013

A list of custom date and time formatting characters can be found here